I'm not sure whether you can use it without registering it or not. I wasn't concerned about that when I got mine, so didn't pay that much attention. My feeling is that you're going to have to at least sign in to your Amazon account with it. I think they already register the device before they send it and you can see it in your "Content and Devices" before you ever get it.
I don't think you'll see any difference with Calibre than you're already used to, so I don't know what Jon is talking about. I use mine with Calibre exclusively to download my books without any problems.
The screen on the new Paperwhite is amazing; I'm sure you'll like it. And the battery life is the best I've seen on any of my Kindles.
One thing to consider is that the new one has slim bezels and you might want to consider a cover for it because of this. Also, I notice that when the page refreshes, it sometimes jumps an extra page. Seems to me we saw this behavior in a kIndle back in the day so maybe it'll be corrected in a future software update. In the meantime, making it refresh every page mostly eliminates the problem.
I bought at Kobo Libra 2 at the same time and I much prefer the screen on the Kindle.
Jim
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